I have to convert a lot so I just use 1 inch = 2.5 CM (not exact, but close enuff) and easy to remember.

As an Engineer wish the heck we had changed back in the 1970s when it was seriously discussed. Except for gal -->liter. I do NOT want to think of how expensive gasoline is in liters. Nor how fast the the meter spins on the gas pump in liters.

Well - it is too late to make them compact - the ones that are quite leggy. One thing to help prevent legginess to a degree is to add a fan blowing over the seeds. Running a fan provides many other benefits as well, but studies have shown that it helps to make stems stronger and that helps prevent legginess.

When I use a plastic cover on my seedling trays, I remove it for a few hours daily and remove completely once I have solid germination. If I use one. But these days I seldom use a cover. Do you have a picture of your propagator?

I don't cover any of my germinating seeds any longer either. I should throw those domes away. They just take up valuable space.

My fans run 24 hrs. in the greenhouses (one in each greenhouse). During the daylight hours, two fans run in each greenhouse and I have the same set-up in the solarium as well. I just installed a "dually" fan and I love it. I ordered a second one yesterday and that's what I will use in the solarium. They are quieter than the 20" box fan and having two fans per unit allows me to direct the air-movement in two directions. Neat fans.

At this moment I do not have a picture. It is one with bottom heat with a thermostate. The lid does have slides in it. Witch I already did open during the day. I did now take it of, and for the night I will put it back till the morning. Hope that is better. After all during the night the temp can droge now in winter.

Adeniumgirl said:Perhaps it is also better to remove the lid from the propagator so they get more fresh air. I guess being in a closed propagator is also making them leggy.

The primary causes of legginess are both light related. Not enough or seedlings reaching for the light.

I use older technology fluorescent lights that put out virtually no heat. I lower them so that they are sitting only a few centimeters above the plants. As the plants grow, I raise the chains still keeping them very close.